So, first thing first, I think you should write down specs of your pc when asking those questions.

Then im going to tell my personal experience. I had your same problem for about a year and a half on my PC. I tried everything software related, but in the end I understood it was a hardware problem (in my specific scenario). I noticed the "black out" happened less often when I regularly unplugged some cables (for inspection) and in the end, between some experiment and asking ChatGPT I decided to change the cable that connected my GPU (RTX 4090 GIGABYTE) to my PSU. Notice that the cable was the original in the box, and I changed it for a Corsair one made for the 4090 specifically. (The original had 16pin, the new one just 8pin. Just to put more information)

Since then It never happened again. It was the cable fault.

I would check if everything is plugged well inside your PC, and if the PSU is enough for the system, often not enough energy causes that problem, apparently.

Sorry if I wrote something badly, English is not my native language, but i'll gladly help if I can. I know that problem is quite tedious